Sewing machines



March 27, 1956 H. RABEZZANA 2,739,551

SEWING MACHINES Filed Jan. 21, 1955 IN VEN TOR.

United States atent 2,739,55i Patented Mar. 2?, 1956 SEWING MACHINES Hector Rabezzana, Fenton, Mich. Application January 21, 195$,Se'rial No. 332,153

.2 Claims. (Cl. 112-220} Thepresentinvention relates to sewing machines and more'particularly relates to an improved sewing machine constructionwherein the sewing machine motor'may-be readily disengaged from the handwheel'topermitthe use of thesewing machine motor, forexample, in the winding of'bobbins, without requiring the operation of the entire sewing machine mechanism.

It is an object of the present invention to provide-an improved sewing machine construction which is economi- -cal 'ofmanufacture, simple in designyand reliable and etficient in operation.

Itis afurther object of the present invention to provide an'improved sewingmachine construction of the abovementioned type whereina novel motor mounting is'incorpcrated permitting the motor to be moved readily to break the operative connection between the motor and the sewing machine handwheel.

:It is a further object of the present invention to provide anzimproved sewing machine construction of the'above- :mentioned type wherein the output shaft ofthersewing rmachine motor is adapted to receive and directly engage a bobbin whereby the bobbin may be quickly wound by operation of'the sewing machine-motor, while the re- Jmaining. sewing machine mechanism is idle.

.:Another'objectof thepresent'invention is to-provide animproved .sewingmachine construction wherein the 4 .sewingmachinemotor is mounted'within the'frame and the position of the sewing machine motor may be varied by means extending externally of the sewing machine frame for moving the sewing machine motor to make and break the operative connection between it and the sewing machine handwheel.

Other and more detailed objects of the present invention will be appreciated from a consideration of the following specification, the appended claims, and the accompanying drawing, wherein:

Figure 1 is a fragmentary view partially in elevation and partially in section, of a sewing machine embodying the present invention, showing the motor disposed with the output shaft drive wheel in engagement with the handwheel;

Figure 2 is a fragmentary end view partially in elevation and partially in section; and,

Figure 3 is a fragmentary view similar to Figure 1 showing the sewing machine motor disposed with the drive wheel on the output shaft thereof out of engagement with the sewing machine handwheel.

Referring to the drawing, the sewing machine generally indicated at comprises an upper frame 12 which is covered by outer shell elements 14 which provide the desired appearance for the sewing machine. The frame 12 also rotatably supports a handwheel 16, which in the illustrated embodiment, is formed of a stamping to facilitate quick starts and quick stops of the sewing machine.

In the preferred embodiment illustrated, the motor- 18 is mounted within the sewing machine frame 12 and includes an output shaft 20 to which is secured a drive wheel 22 which has a smooth conical or taperediperipheral surface portion 24 which is adapted to engage "the smooth outer peripheral portion 26 of the han'dwheel 16. The motor output shaft 20 has a tapered outer end portion 28 extending out- 'wardly"beyond'the drive wheel 24. This tapered outer end portion is adapted to receive and frictionally engage the hubgportionofabobbin (not shown) for effecting rotation'iofthe bobbin with the motor shaft 20, for wind- .ing the bobbin. 4 It will be appreciated, that with the motor in" the position illustrated in Figure 3, the motor may be operated "to quickly wind at bobbin supported on the tapered'outer'en'd portion 28 of the output shaft '20, and during such operation of the motor.18,'the handwheel 16, and all of .the remainingsewing machine mechanism which is "driven-through it, will remain stationary.

'A'pair of generally rectangular plates 30 and 32 are Welded'or otherwise suitably secured to the motor 18, and engage the inner surface of the adjacentrportion of the frame 12, as best illustrated in Figure 2. The plates TStlfan'd '32 carry a trunnion 34 and a cam 36, which are adjustablysecured to the plates 30 and 32 by screws 38 and40, respectively which are disposed eccentrically .of the trunnion 34 and cam 36. The trunnion 34 and cam '36 arecylindrical andhave radially outwardly extending flanges 42 and 44 which overlie an-outer surface of the frame 12 and co-.operate withitherplates 3'0 and 32 to 'hold'theniotor 18 against movement transversely of the frame '12.

Asil'lustratedinFigures '1 and 3, thelfr'ame' 12 isfprovi'de'dwith'a cylindrical bearing 46 in which the trunnion 34 is journaled. This construction it willbe seen,mounts the'motor 18on the frame 12 for pivotal movement about the axisofthe'trunnion 34. The frame '12 is alsoprovided with a second aperture 48, in which the cylindrical *cam "36is-loosely received as illustrated in the drawing,

and which' permits a limited pivotal movement of the motor 1 8 about the axisoffthe trunion 'sdbetween the positions illustrated in Figures land '3.

The screw 40 :is received 1 in an :eccentrically ilocated :apertures through the.:camF36,.which aperture'hasareduced inner portion 50 receiving a cylindrical shank portion 52 of the screw 40, and also has an enlarged outer portion 54 in which the head of the screw 40 is disposed and which is internally threaded to receive the threaded shank portion of another screw 56. The screw 40 has a threaded end portion 58 which engages co-operating threads on the plate 32. The cam 36 has a pair of opposed slots 60 formed in its outer end extending radially outwardly from the enlarged portion 54 of the aperture through the cam 36. These slots 60 receive the end portions of a handle loop 62 and these end portions are held in place within the slots 60 by the head of the screw 56 which extends over a part of these end portions. It will be appreciated that this handle loop 62 provides a means disposed externally of the shell 14 and which may be manually engaged to effect rotation of the cam 36. The handle loop 62 may be pivoted about its end portions to a position in which it is flat against the shell 14, when it is not being used.

It will now be appreciated that pivotal movement of the motor 18 between the engaged and disengaged positions illustrated in Figures 1 and 3 may be effected by rotating the cam 36 by means of the handle loop 62. It will be noted that the cam 36 is at all times supported at its under side by the frame 12 and that the construction is such that when the drive wheel 22 is properly engaged with the peripheral portion 26 of the handwheel 16, the cam 36 is so disposed that the eccentric aperture therethrough in which the motor mounting screw 40 is disposed, is substantially at the highest point to which it may be moved by rotation of the cam 36. By this construction there is a resulting self-locking effect holding the cam 36 in the proper engaged position.

It will be appreciated that in the assembly of the sewing machine at the factory the cylindrical trunnion 34 may be adjusted to and secured in the desired position by loosening the screw 3-8, rotating the trunnion 34 about the axis of the screw 38 and then tightening the screw 38 to thereby accurately locate the trunnion 34 about which the pivotal movement of the motor is effected by means of rotation of the cam 36 through engagement of the hand loop 62.

It will also be appreciated that when the sewing machine operator desires to wind a bobbin this may be readily accomplished by manually engaging the hand loop 62 and turning the cam 36 so as to lower the drive wheel 22 to the disengaged position illustrated in Figure 3. When the motor is in the position there illustrated, the bobbin may be mounted on the tapered outer end portion 28 of the motor output shaft 20 and the motor 18 may be operated for quickly winding the bobbin. During such operation of the motor and winding of the bobbin the other parts of the sewing machine will remain stationary because of the disposition of the drive wheel 22 out of engagement with the hand wheel 16.

While only one specific embodiment of the present invention has been illustrated and described in detail, it will be readily appreciated by those skilled in the art that numerous modifications and changes may be made in the present invention without departing from the spirit of the invention.

What is claimed is:

1. A sewing machine comprising a frame, a handwheel rotatably mounted on said frame, an electric motor having an output shaft and a drive wheel mounted on said shaft for rotation therewith, means pivotally mounting said motor within said frame and including a trunnion secured to said motor, said trunnion being movable about an eccentric axis for adjusting said trunnion relative to said motor, said frame having a bearing in which said trunnion is journaled, a cam rotatably mounted on said motor and engaging said frame to support said motor on said frame, a handle disposed externally of said frame and connected to said cam for rotating said cam and moving said motor between a first position in which said drive wheel is pressed against said handwheel with a predetermined desired pressure and a second position in which said drive wheel is disengaged from said handwheel, said motor being disposed in said first position when the high point of said cam is disposed substantially on a line perpendicular to the axis of said handwheel and passing through the axis of pivotal movement of said cam.

2. A sewing machine comprising a frame member; a handwheel mounted on said frame member for rotation about a generally horizontal axis; an electric motor member having an output shaft and a drive Wheel mounted on said shaft for rotation therewith; cooperating eccentric means on said frame member and said motor member pivotally connecting said motor to said frame member for pivotal movement about a second axis extending in spaced relation and at right angles to a vertical plane including said horizonal axis of said handwheel; other co-operating means on said frame member and said motor member spaced from said first named co-operating means for supporting said motor with said output shaft disposed generally horizontally and pivotally moving said motor member about said second axis through a small angle between a first position in which said drive wheel is pressed against said handwheel with a predetermined desired pressure and a second position in which said drive wheel is disengaged from said handwheel, said other co-operating means comprising an eccentric cam on one of said members in spaced relation to said first named means and engaging the other of said members to co-operate in supporting said motor member on said frame member, and handle means on said eccentric cam externally of said frame member for operating said cam and moving said motor member between said first position and said second position.

References Cited in the file of this patent UNITED STATES PATENTS 1,354,603 Doubler Oct. 5, 1920 1,377,016 Maimin May 3, 1921 2,018,624 Eames Oct. 22, 1935 2,144,801 Hohmann Ian. 24, 1939 FOREIGN PATENTS 240,607 Switzerland Apr. 1, 1946 284,777 Switzerland Dec. 16, 1952 346,094 Germany Dec. 24, 1921 34,296 Norway Mar. 6, 1922 

